High-strength workpiece forming method based on reverse aluminum extrusion die and S-shaped workpiece

Abstract

The invention provides a high-strength workpiece forming method based on a reverse aluminum extrusion die and an S-shaped workpiece. According to the high-strength workpiece forming method based on the reverse aluminum extrusion die, the five-series aluminum alloy column is heated and softened by heating the material container, so that the five-series soft column is obtained; the V-series soft column is subjected to reverse aluminum extrusion operation through the moving die head, so that the V-series soft column sequentially passes through the S-shaped extrusion inlet, the S-shaped expansion cavity and the extrusion outlet, an S-shaped workpiece is obtained, and due to the fact that the S-shaped expansion cavity with the larger inner contour is provided with the receding area in the projection direction of the hook groove forming protrusion, the V-series soft column can be extruded in the reverse direction. The S-shaped pre-workpiece smoothly entering the S-shaped expansion cavity can avoid the cavity wall of the S-shaped expansion cavity through the receding area, so that interference borne by the hook groove structure in the moving process is reduced, the S-shaped pre-workpiece can be smoothly pushed out of the extrusion opening, and the situation that the hook groove structure is deformed or fractured is reduced.

Description

Technical Field

[0001] This disclosure relates to the technical field of aluminum extrusion forming of high-strength workpieces, and in particular to a method for forming high-strength workpieces based on a reverse aluminum extrusion die and an S-shaped workpiece. Background Technology

[0002] To ensure safety during lifting and rock climbing operations, the lifting and climbing components used are typically high-strength parts made of five-series aluminum alloy. Currently, most manufacturers employ aluminum profile extrusion devices, such as those disclosed in Chinese patent document CN103537508A, to form these high-strength components. For example... Figure 1 The S-shaped workpiece 10 shown has a hook groove structure 101 formed at the end to meet the need for hanging. However, since the hardness of the five-series aluminum alloy is usually between 45HB and 75HB, a greater extrusion force is required during the forming process. As a result, the hook groove structure 101 of the S-shaped workpiece 10 is prone to deformation or even breakage due to excessive stress. Summary of the Invention

[0003] The purpose of this disclosure is to overcome the shortcomings of the prior art and provide a method for forming high-strength workpieces based on a reverse aluminum extrusion die and S-shaped workpieces that can be smoothly formed by a hook-groove structure.

[0004] The purpose of this disclosure is achieved through the following technical solution: A method for forming high-strength workpieces based on a reverse aluminum extrusion die, wherein the reverse aluminum extrusion die comprises: The transfer die head has an S-shaped extrusion inlet, an S-shaped expansion cavity and an extrusion outlet connected in sequence. The inner contour of the S-shaped expansion cavity is larger than the inner contour of the S-shaped extrusion inlet. The inner wall of the S-shaped extrusion inlet forms a hook-groove protrusion, and the S-shaped expansion cavity has an air-avoiding area in the projection direction of the hook-groove protrusion. A heating chamber is used to house and heat a five-series aluminum alloy column; a moving die head is slidably disposed in the heating chamber; an S-shaped extrusion inlet is oriented toward the five-series aluminum alloy column; and the moving die head is used to extrude the five-series aluminum alloy column to form an S-shaped workpiece. The high-strength workpiece forming method based on a reverse aluminum extrusion die includes the following steps: The five-element aluminum alloy column is heated and softened by the heating chamber to obtain a five-element soft column. The five-system soft column is subjected to reverse aluminum extrusion through the moving die head, so that the five-system soft column passes through the S-shaped extrusion inlet, the S-shaped expansion cavity and the extrusion outlet in sequence to obtain the S-shaped workpiece.

[0005] In some embodiments, the reverse aluminum extrusion operation specifically includes the following steps: The S-shaped soft column is subjected to an S-forming operation through the S-shaped extrusion inlet to obtain an S-shaped pre-workpiece; The S-shaped pre-workpiece is formed by the groove forming protrusion, so that a groove structure is formed on the S-shaped pre-workpiece. The S-shaped pre-workpiece is subjected to S-stable operation through the S-shaped expansion cavity to obtain an S-stable workpiece; The S-shaped workpiece is exported through the extrusion port to obtain the S-shaped workpiece.

[0006] In some embodiments, the inner contour of the S-shaped expansion cavity gradually expands from the S-shaped extrusion inlet to the extrusion outlet.

[0007] In some embodiments, the steps of the S-stable operation specifically include the following steps: The S-shaped pre-workpiece is pushed by the transfer die head so that the S-shaped pre-workpiece extends from the S-shaped extrusion inlet to the extrusion outlet through the S-shaped expansion cavity; The S-shaped pre-workpiece is subjected to stress relief operation through the S-shaped expansion cavity to obtain an S-shaped stable workpiece.

[0008] In some embodiments, the S-shaped expansion cavity includes a connected linear guide cavity and two arc-shaped pressure relief cavities. The linear guide cavity is located between the two arc-shaped pressure relief cavities. There is a first gap between the inner contour of each arc-shaped pressure relief cavity and the inner contour of the corresponding portion of the S-shaped extrusion inlet. There is a second gap between the inner contour of the linear guide cavity and the inner contour of the corresponding portion of the S-shaped extrusion inlet. The first gap is greater than the second gap.

[0009] In some embodiments, the stress relief operation specifically includes the following steps: The middle part of the S-shaped pre-workpiece is side-guided and formed through the linear guide cavity, so as to reduce the stress on the cavity wall of the linear guide cavity. The S-shaped pre-workpiece is depressurized and shaped at both ends through the arc-shaped pressure relief chamber, thereby increasing the thickness at both ends of the S-shaped pre-workpiece.

[0010] In some embodiments, the arc-shaped pressure relief cavity sequentially includes an inner guide cavity, a curved thickening cavity, and a void-avoiding guide cavity. The inner guide cavity is close to and connected to the end of the linear guide cavity, and the void-avoiding guide cavity corresponds to the position of the hook groove forming protrusion. The first gap gradually increases from the inner guide cavity and the void-avoiding guide cavity toward the curved thickening cavity.

[0011] In some embodiments, the pressure relief and shaping operation specifically includes the following steps: The internal guide cavity and the air-avoiding guide cavity are used to perform an internal pressure relief operation on the corresponding end of the S-shaped pre-workpiece, so that the thickness of the S-shaped pre-workpiece corresponding to the position of the curved thickening cavity increases.

[0012] In some embodiments, the five-series aluminum alloy column comprises the following components in parts by weight: Silicon 0.4 parts; 0.1 parts copper; Magnesium 4.8 to 5.5 parts; 0.2 parts zinc; 0.5 parts manganese; 0.3 parts chromium; Iron 0.4 parts; 0.05 parts titanium; The balance is Al, and impurities are controlled to be below 0.5 parts.

[0013] An S-shaped workpiece, wherein the S-shaped workpiece is prepared by the high-strength workpiece forming method based on a reverse aluminum extrusion die according to any of the above embodiments.

[0014] Compared with the prior art, this disclosure has at least the following advantages: The aforementioned high-strength workpiece forming method based on a reverse aluminum extrusion die achieves a significantly reduced hardness by heating and softening the five-series aluminum alloy column through a heated slurry. Then, a reverse aluminum extrusion operation is performed on the five-series soft column using a moving die, further reducing the extrusion pressure. Thus, the S-shaped pre-workpiece formed from the five-series soft column through the S-shaped extrusion inlet can form a hook-groove structure under the action of the hook-groove forming protrusion. Furthermore, because the larger inner contour of the S-shaped expansion cavity has an clearance zone in the projection direction of the hook-groove forming protrusion, the S-shaped pre-workpiece smoothly entering the S-shaped expansion cavity can avoid the cavity wall through the clearance zone, thereby reducing interference during the movement of the hook-groove structure. This allows the S-shaped pre-workpiece to be ejected more smoothly from the extrusion outlet, reducing the occurrence of hook-groove structure deformation or breakage. Attached Figure Description

[0015] To more clearly illustrate the technical solutions of the embodiments of this disclosure, the accompanying drawings used in the embodiments will be briefly described below. It should be understood that the following drawings only show some embodiments of this disclosure and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the structure of an S-shaped workpiece formed from 5-series aluminum alloy; Figure 2 This is a flowchart of a high-strength workpiece forming method based on a reverse aluminum extrusion die according to an embodiment of the present disclosure; Figure 3 This is a cross-sectional view of a reverse aluminum extrusion die according to another embodiment of the present disclosure; Figure 4 for Figure 3 A cross-sectional view of the traveling die head of the reverse aluminum extrusion die shown; Figure 5 for Figure 4 The enlarged view shown at point A in the middle; Figure 6 This is a cross-sectional view of a reverse aluminum extrusion die according to yet another embodiment of the present disclosure; Figure 7 for Figure 6 The enlarged view shown at point B in the middle; Figure 8 To adopt Figure 2 A physical image of an S-shaped workpiece manufactured using a high-strength workpiece forming method based on a reverse aluminum extrusion die; Figure 9 for Figure 3 A physical image of the moving die head of the reverse aluminum extrusion die.

[0017] Figure label: 10. S-shaped workpiece; 101. Hook and groove structure; 20. Five-series aluminum alloy column; 30. S-shaped pre-workpiece; 100. Transfer die head; 110. S-shaped extrusion inlet; 1110. Hook and groove forming protrusion; 120. S-shaped expansion cavity; 1210. Linear guide cavity; 1220. Arc-shaped pressure relief cavity; 1221. Inner guide cavity; 1222. Curved thickening cavity; 1223. Air-avoiding guide cavity; 130. Extrusion outlet; 200. Heated material tank; 210. Receiving cavity; 201. Arc-shaped reflux groove; 300, pre-ejection structure; 310, central support part; 3110, outlet hole; 320, peripheral guide part; 3210, inlet port; 301, buffer cavity 301. Detailed Implementation

[0018] To facilitate understanding of this disclosure, a more complete description will be given below with reference to the accompanying drawings, which illustrate preferred embodiments of the present disclosure. However, this disclosure can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of the disclosure.

[0019] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly attached to the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0020] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of this disclosure. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0021] This disclosure provides a method for forming high-strength workpieces using a reverse aluminum extrusion die. The method employs a reverse aluminum extrusion die. Specifically, the reverse aluminum extrusion die includes a moving die and a heating chamber. The moving die has an S-shaped extrusion inlet, an S-shaped expansion cavity, and an extrusion outlet connected sequentially. The inner contour of the S-shaped expansion cavity is larger than the inner contour of the S-shaped extrusion inlet. A hook-groove protrusion is formed on the inner wall of the S-shaped extrusion inlet. An clearance area is provided in the S-shaped expansion cavity along the projection direction of the hook-groove protrusion. The heating chamber is used to accommodate and heat a five-series aluminum alloy column. The moving die is slidably disposed within the heating chamber, with the S-shaped extrusion inlet facing the five-series aluminum alloy column. The moving die is used to extrude the five-series aluminum alloy column to form an S-shaped workpiece.

[0022] The above-mentioned high-strength workpiece forming method based on reverse aluminum extrusion die includes: heating and softening the five-series aluminum alloy column by heating the slurry to obtain a five-series soft column; and performing a reverse aluminum extrusion operation on the five-series soft column by a moving die head so that the five-series soft column passes through the S-shaped extrusion inlet, the S-shaped expansion cavity and the extrusion outlet in sequence to obtain an S-shaped workpiece.

[0023] It is understandable that heating the pentylene aluminum alloy column to soften it can result in a pentylene soft column with significantly reduced hardness. Then, the pentylene soft column is subjected to reverse aluminum extrusion through a moving die, which further reduces the extrusion pressure on the pentylene soft column. Thus, the S-shaped pre-workpiece formed by the pentylene soft column through the S-shaped extrusion inlet can form a hook-groove structure under the action of the hook-groove forming protrusion. Furthermore, because the S-shaped expansion cavity with a larger inner contour has a clearance area in the projection direction of the hook-groove forming protrusion, the S-shaped pre-workpiece that smoothly enters the S-shaped expansion cavity can avoid the cavity wall of the S-shaped expansion cavity through the clearance area, thereby reducing the interference encountered when the hook-groove structure moves. This allows the S-shaped pre-workpiece to be pushed out of the extrusion outlet more smoothly, reducing the occurrence of hook-groove structure deformation or breakage.

[0024] To better understand the technical solutions and beneficial effects of this disclosure, the following detailed description is provided in conjunction with specific embodiments: Please see Figures 2 to 4 One embodiment of the high-strength workpiece forming method based on a reverse aluminum extrusion die employs a reverse aluminum extrusion die. Specifically, the aforementioned reverse aluminum extrusion die includes a moving die head 100 and a heating sump 200. The moving die head 100 has an S-shaped extrusion inlet 110, an S-shaped expansion cavity 120, and an extrusion outlet 130 connected in sequence. The inner contour of the S-shaped expansion cavity 120 is larger than the inner contour of the S-shaped extrusion inlet 110. The inner wall of the S-shaped extrusion inlet 110 forms a hook-groove forming protrusion 1110. The S-shaped expansion cavity 120 has a clearance area in the projection direction of the hook-groove forming protrusion 1110. The heating sump 200 is used to accommodate and heat the five-series aluminum alloy column 20. The moving die head 100 is slidably disposed in the heating sump 200. The S-shaped extrusion inlet 110 is oriented toward the five-series aluminum alloy column 20. The moving die head 100 is used to extrude the five-series aluminum alloy column 20 to form an S-shaped workpiece 10. The aforementioned reverse aluminum extrusion die is applicable to the following high-strength workpiece forming method based on the reverse aluminum extrusion die.

[0025] The above-mentioned high-strength workpiece forming method based on reverse aluminum extrusion die includes some or all of the following steps.

[0026] The five-element aluminum alloy column 20 is heated and softened by heating the material tank 200 to obtain a five-element soft column; Please see Figure 3In this embodiment, the heating chamber 200 has a receiving cavity 210, through which a five-series aluminum alloy column 20 can be inserted. The five-series aluminum alloy column 20 is a column structure obtained by casting five-series aluminum alloy. The outer periphery of the five-series aluminum alloy column 20 is adapted to the receiving cavity 210, so that the five-series aluminum alloy column 20 can be just accommodated in the receiving cavity 210. The outer periphery of the five-series aluminum alloy column 20 is in contact with the inner periphery of the receiving cavity 210. In this way, by increasing the heating temperature of the heating chamber 200, a large amount of heat can be transferred to the five-series aluminum alloy column 20, thereby gradually softening the five-series aluminum alloy column 20 to obtain a five-series soft column. The five-series soft column has lower hardness and can reduce the extrusion pressure during the molding process.

[0027] The five-system soft column is subjected to reverse aluminum extrusion through the moving die head 100, so that the five-system soft column passes through the S-shaped extrusion inlet 110, the S-shaped expansion cavity 120 and the extrusion outlet 130 in sequence to obtain the S-shaped workpiece 10.

[0028] Please see Figure 3 In this embodiment, after the five-element aluminum alloy column 20 softens into a five-element soft column, the hardness of the five-element aluminum alloy column 20 is significantly reduced. Since the S-shaped extrusion inlet 110 of the transferring die head 100, which is slidably disposed in the heating sump 200, is oriented towards the five-element aluminum alloy column 20, the transferring die head 100 can be pushed to slide relative to the heating sump 200, thereby extruding the five-element soft column. At this time, the five-element soft column is subjected to extrusion force and enters the S-shaped extrusion inlet 110 to form an S-shaped pre-workpiece 30, and passes through the hook groove formed on the inner wall of the S-shaped extrusion inlet 110. The forming protrusion 1110 forms a hook groove structure 101 on the S-shaped pre-workpiece 30. Since the S-shaped expansion cavity 120 with a larger inner contour is provided with a clearance area in the projection direction of the hook groove forming protrusion 1110, the extrusion pressure required for the S-shaped pre-workpiece 30 to enter the S-shaped expansion cavity 120 is further reduced. Furthermore, the clearance area allows the S-shaped expansion cavity 120 to provide clearance for the hook groove structure 101, thereby reducing the interference encountered by the hook groove structure 101 during movement. This allows the S-shaped pre-workpiece 30 to be ejected more smoothly from the extrusion port 130, ultimately resulting in the S-shaped workpiece 10.

[0029] It is understandable that heating the five-series aluminum alloy column 20 by heating the material hopper 200 can result in a five-series soft column with significantly reduced hardness. Then, the five-series soft column is subjected to reverse aluminum extrusion by the transfer die head 100, which further reduces the extrusion pressure of the transfer die head 100 on the five-series soft column. Thus, the S-shaped pre-workpiece 30 formed by the five-series soft column through the S-shaped extrusion inlet 110 can form a hook groove structure 101 under the action of the hook groove forming protrusion 1110. Furthermore, since the S-shaped expansion cavity 120 with a larger inner contour has a clearance area in the projection direction of the hook groove forming protrusion 1110, the S-shaped pre-workpiece 30 that smoothly enters the S-shaped expansion cavity 120 can avoid the cavity wall of the S-shaped expansion cavity 120 through the clearance area, thereby reducing the interference encountered by the hook groove structure 101 when it moves. This allows the S-shaped pre-workpiece 30 to be pushed out of the extrusion outlet 130 more smoothly, thereby reducing the occurrence of deformation or breakage of the hook groove structure 101.

[0030] In some embodiments, the reverse aluminum extrusion operation specifically includes the following steps: The S-shaped soft column is subjected to an S-forming operation through the S-shaped extrusion inlet 110 to obtain an S-shaped pre-workpiece 30. Please see Figure 3 In this embodiment, after the five-element aluminum alloy column 20 is heated and softened into a five-element soft column by heating the material tank 200, the hardness of the five-element aluminum alloy column 20 decreases significantly. At this time, by sliding the transfer die head 100 relative to the heating material tank 200, the transfer die head 100 extrudes the five-element soft column. The five-element soft column can enter the S-shaped extrusion inlet 110 under a smaller extrusion force. Since the S-shaped extrusion inlet 110 is S-shaped, the five-element soft column will be formed into an S-shape by the S-shaped extrusion inlet 110, thereby obtaining an S-shaped pre-workpiece 30 with a smaller extrusion force.

[0031] The S-shaped pre-workpiece 30 is grooved by the grooving protrusion 1110 so that a grooving structure 101 is formed on the S-shaped pre-workpiece 30. Please see Figure 4 and Figure 5 In this embodiment, the groove forming protrusion 1110 protrudes laterally from the inner wall of the S-shaped extrusion inlet 110. During the process of the five-stage soft column entering the S-shaped extrusion inlet 110, the groove structure 101 can be simultaneously formed on the S-shaped pre-workpiece 30 to improve the forming efficiency of the groove structure 101. Specifically, the groove forming protrusion 1110 is integrally formed on the inner wall of the S-shaped extrusion inlet 110. The groove forming protrusion 1110 is located inside the S-shaped extrusion inlet 110 and is located near the end of the S-shaped extrusion inlet 110.

[0032] The S-shaped pre-workpiece 30 is subjected to S-stabilization operation through the S-shaped expansion cavity 120 to obtain the S-stabilized workpiece. Please see Figure 4In this embodiment, after the five-system soft column is formed into an S-shaped pre-workpiece 30 through the S-shaped extrusion inlet 110, the S-shaped pre-workpiece 30 will convert the extrusion pressure of the transfer die head 100 into radial pressure. Since the inner contour of the S-shaped expansion cavity 120 is larger than the inner contour of the S-shaped extrusion inlet 110, when the S-shaped pre-workpiece 30 enters the S-shaped expansion cavity 120, the S-shaped pre-workpiece 30 can release the radial pressure in the S-shaped expansion cavity 120 in a timely manner, so as to reduce the occurrence of the S-shaped pre-workpiece 30 getting stuck in the transfer die head 100. Specifically, the inner contour of the S-shaped expansion cavity 120 is the radial contour of the S-shaped expansion cavity 120, the inner contour of the S-shaped extrusion inlet 110 is the radial contour of the S-shaped extrusion inlet 110, the inner contour of the S-shaped expansion cavity 120 is S-shaped, the S-shaped pre-workpiece 30 will expand radially after the pressure is released, and thus the cavity wall of the S-shaped expansion cavity 120 is shaped into an S-shape. Then, as the S-shaped pre-workpiece 30 gradually cools down, the S-shaped pre-workpiece 30 can finally be shaped into an S-shaped stable workpiece by the S-shaped expansion cavity 120.

[0033] The S-shaped workpiece is exported through the extrusion port 130 to obtain the S-shaped workpiece 10.

[0034] Please see Figure 4 In this embodiment, after the S-shaped pre-workpiece 30 is shaped into an S-shaped stable workpiece through the S-shaped expansion cavity 120, the transferring die head 100 continues to push the rear end of the five-stage flexible column, thereby pushing the S-shaped stable workpiece to the extrusion port 130, and then the S-shaped stable workpiece can be outwardly exported as the S-shaped workpiece 10 through the extrusion port 130. Specifically, the extrusion port 130 is a rounded rectangular port, and the inner contour of the extrusion port 130 is larger than the inner contour of the S-shaped expansion cavity 120, thereby further reducing the interference of the inner wall of the extrusion port 130 on the S-shaped stable workpiece, so that the S-shaped stable workpiece can be pushed out more smoothly to obtain the S-shaped workpiece 10.

[0035] It is understandable that when the five-system soft column is formed into an S-shaped pre-workpiece 30 through the S-shaped extrusion inlet 110, the hook groove structure 101 can be quickly formed on the S-shaped pre-workpiece 30 through the hook groove forming protrusion 1110. Then, since the inner contour of the S-shaped expansion cavity 120 is larger than the inner contour of the S-shaped extrusion inlet 110, the S-shaped pre-workpiece 30 pushed out by radial pressure can release pressure in the S-shaped expansion cavity 120 and be shaped into an S-shaped stable workpiece. Then, the S-shaped stable workpiece is continued to move through the transfer die head 100 to be exported to the extrusion port 130 with rounded corners, so as to finally smoothly output the S-shaped stable workpiece into the S-shaped workpiece 10.

[0036] Please see Figure 3In some embodiments, the inner contour of the S-shaped expansion cavity 120 gradually expands from the S-shaped extrusion inlet 110 to the extrusion outlet 130. It can be understood that, since the inner contour of the S-shaped expansion cavity 120 gradually expands from the S-shaped extrusion inlet 110 to the extrusion outlet 130, that is, the inner contour of the S-shaped expansion cavity 120 near the extrusion outlet 130 is larger than the inner contour near the S-shaped extrusion inlet 110, as the S-shaped pre-workpiece 30 moves from the S-shaped extrusion inlet 110 to the extrusion outlet 130, the S-shaped pre-workpiece 30 can adapt to the inner contour of the S-shaped expansion cavity 120 and gradually expand, thereby allowing the S-shaped pre-workpiece 30 to be gradually shaped into an S-stable workpiece. This reduces material jamming and wear caused by sudden distortion of the S-shaped pre-workpiece 30 during movement, thereby improving the overall consistency of the appearance and strength of the formed S-stable workpiece.

[0037] In some embodiments, the steps of S-stable operation specifically include the following steps: The S-shaped pre-workpiece 30 is pushed by the transfer die head 100 so that the S-shaped pre-workpiece 30 extends from the S-shaped extrusion inlet 110 to the extrusion outlet 130 through the S-shaped expansion cavity 120. Please see Figure 3 In this embodiment, when the S-shaped pre-workpiece 30 is subjected to S-stabilization operation through the S-shaped expansion cavity 120, the moving die head 100 will continuously squeeze the five-system soft column located at the rear end of the S-shaped pre-workpiece 30, so that the five-system soft column is successively squeezed into the S-shaped extrusion inlet 110, thereby indirectly pushing the S-shaped pre-workpiece 30 to gradually extend from the S-shaped extrusion inlet 110 to the extrusion outlet 130.

[0038] The S-shaped pre-workpiece 30 is subjected to stress relief operation through the S-shaped expansion cavity 120 to obtain the S-shaped stable workpiece.

[0039] Please see Figure 3 In this embodiment, as the S-shaped pre-workpiece 30 extends, the inner contour of the S-shaped expansion cavity 120 gradually expands from the S-shaped extrusion inlet 110 to the extrusion outlet 130, allowing the S-shaped pre-workpiece 30 to adapt to the expansion of the inner contour of the S-shaped expansion cavity 120 during the extension process and gradually release stress. This reduces the jamming and wear caused by the sudden distortion of the S-shaped pre-workpiece 30 during movement, thereby improving the overall consistency of the appearance and strength of the formed S-shaped stable workpiece.

[0040] It is understandable that, as the inner contour of the S-shaped expansion cavity 120 gradually expands from the S-shaped extrusion inlet 110 to the extrusion outlet 130, as the moving die head 100 indirectly pushes the S-shaped pre-workpiece 30 forward, the S-shaped pre-workpiece 30 can adapt to the expansion of the inner contour of the S-shaped expansion cavity 120 during the extension process and gradually release stress. This can effectively reduce the jamming and wear caused by the sudden distortion of the S-shaped pre-workpiece 30 during the movement, thereby improving the overall consistency of the appearance and strength of the formed S-shaped stable workpiece.

[0041] Please see Figure 4 In some embodiments, the S-shaped expansion cavity 120 includes a connected linear guide cavity 1210 and two arc-shaped pressure relief cavities 1220. The linear guide cavity 1210 is located between the two arc-shaped pressure relief cavities 1220. There is a first gap between the inner contour of each arc-shaped pressure relief cavity 1220 and the inner contour of the corresponding part of the S-shaped extrusion inlet 110, and there is a second gap between the inner contour of the linear guide cavity 1210 and the inner contour of the corresponding part of the S-shaped extrusion inlet 110. The first gap is greater than the second gap.

[0042] It is understandable that, due to the first difference between the inner contour of each arc-shaped pressure relief cavity 1220 and the inner contour of the corresponding part of the S-shaped extrusion inlet 110, and the second difference between the inner contour of the linear guide cavity 1210 and the inner contour of the corresponding part of the S-shaped extrusion inlet 110, the first difference is greater than the second difference, which makes the expandable space provided by the two arc-shaped pressure relief cavities 1220 greater than the expandable space of the linear guide cavity 1210. Each end of the linear guide cavity 1210 is connected to the corresponding arc-shaped pressure relief cavity 1220, so that the part of the S-shaped pre-workpiece 30 corresponding to the linear guide cavity 1210 can move to each arc-shaped pressure relief cavity 1220 under the guidance of the linear guide cavity 1210, thereby guiding the axial pressure on the S-shaped pre-workpiece 30 radially. In this way, the overall stress of the S-shaped pre-workpiece 30 is more dispersed, reducing the occurrence of deformation or fracture.

[0043] In some embodiments, the stress relief operation specifically includes the following steps: The middle part of the S-shaped pre-workpiece 30 is side-guided and formed by the linear guide cavity 1210, so as to reduce the stress on the cavity wall of the linear guide cavity 1210. Please see Figure 4 In this embodiment, as the S-shaped pre-workpiece 30 enters the S-shaped expansion cavity 120, the portion of the S-shaped pre-workpiece 30 corresponding to the linear guide cavity 1210 expands to release pressure, and this portion expands laterally under the guidance of the cavity wall of the linear guide cavity 1210, thereby quickly releasing stress. As a result, the force on the cavity wall of the linear guide cavity 1210 will be greatly reduced and dispersed radially, thereby reducing the occurrence of deformation or breakage of the S-shaped pre-workpiece 30.

[0044] The S-shaped pre-workpiece 30 is depressurized and shaped at both ends by means of the arc-shaped pressure relief chamber 1220, so as to increase the thickness at both ends of the S-shaped pre-workpiece 30.

[0045] Please see Figure 4In this embodiment, as part of the S-shaped pre-workpiece 30 expands laterally under the guidance of the linear guide cavity 1210, part of the S-shaped pre-workpiece 30 will move towards the arc-shaped pressure relief cavity 1220 to release pressure. As a result, the thickness at both ends of the S-shaped pre-workpiece 30 will increase and be shaped under the action of the arc-shaped pressure relief cavity 1220, thereby increasing the structural strength at both ends of the S-shaped pre-workpiece 30. This allows the hook groove structure 101 formed at the end of the S-shaped pre-workpiece 30 to have higher strength, thereby reducing the occurrence of deformation or breakage of the hook groove structure 101 of the S-shaped workpiece 10.

[0046] It is understood that by guiding the middle part of the S-shaped pre-workpiece 30 to both sides through the linear guide cavity 1210, the part of the S-shaped pre-workpiece 30 can move towards the arc-shaped pressure relief cavity 1220 to release pressure, thereby increasing the structural strength at both ends of the S-shaped pre-workpiece 30, and thus enabling the hook groove structure 101 formed at the end of the S-shaped pre-workpiece 30 to have higher strength, so as to reduce the occurrence of deformation or breakage of the hook groove structure 101 of the S-shaped workpiece 10.

[0047] Please see Figure 5 In some embodiments, the arc-shaped pressure relief cavity 1220 sequentially includes an inner guide cavity 1221, a curved thickening cavity 1222, and a clearance guide cavity 1223. The inner guide cavity 1221 is close to and connected to the end of the linear guide cavity 1210, and the clearance guide cavity 1223 corresponds to the position of the hook groove forming protrusion 1110. The first gap gradually increases from the inner guide cavity 1221 and the clearance guide cavity 1223 toward the curved thickening cavity 1222. It is understandable that, since the inner guide cavity 1221 is close to and connected to the end of the linear guide cavity 1210, the clearance guide cavity 1223 can be connected to the end of the linear guide cavity 1210 through the curved thickening cavity 1222. The first gap gradually increases from the inner guide cavity 1221 and the clearance guide cavity 1223 to the curved thickening cavity 1222, so that the part of the S-shaped pre-workpiece 30 corresponding to the arc-shaped pressure relief cavity 1220 can move and expand towards the curved thickening cavity 1222 under the guidance of the inner guide cavity 1221 and the clearance guide cavity 1223. That is, the expandable space provided by the curved thickening cavity 1222 is greater than the expandable space provided by the inner guide cavity 1221 and the clearance guide cavity 1223, thereby increasing the thickness of the S-shaped pre-workpiece 30 at the position corresponding to the curved thickening cavity 1222, so as to improve the structural strength of the S-shaped pre-workpiece 30 at the position corresponding to the curved thickening cavity 1222. Furthermore, since the clearance guide cavity 1223 corresponds to the position of the hook groove forming protrusion 1110, the S-shaped pre-workpiece 30 can enter the clearance guide cavity 1223 after the hook groove structure 101 is formed by the hook groove forming protrusion 1110. The clearance guide cavity can provide the hook groove structure 101 with room to move, thereby reducing the stress on the hook groove structure 101 and reducing the occurrence of the hook groove structure 101 of the S-shaped workpiece 10 breaking.

[0048] Please see Figure 5 In some embodiments, the decompression and shaping operation specifically includes the following steps: The inner guide cavity 1221 and the clearance guide cavity 1223 are used to perform an internal pressure relief operation on the corresponding ends of the S-shaped pre-workpiece 30, thereby increasing the thickness of the S-shaped pre-workpiece 30 at the position corresponding to the curved thickening cavity 1222. It can be understood that as a portion of the S-shaped pre-workpiece 30 enters the corresponding inner guide cavity 1221 and clearance guide cavity 1223, the first gap gradually increases from the inner guide cavity 1221 and clearance guide cavity 1223 towards the curved thickening cavity 1222. This allows the portion of the S-shaped pre-workpiece 30 corresponding to the curved pressure relief cavity 1220 to move and expand towards the curved thickening cavity 1222 under the guidance of the inner guide cavity 1221 and clearance guide cavity 1223, thereby improving the structural strength of the S-shaped pre-workpiece 30 at the position corresponding to the curved thickening cavity 1222 and reducing the likelihood of breakage of the hook groove structure 101 on the S-shaped workpiece 10 corresponding to the clearance guide cavity 1223.

[0049] In some embodiments, the five-element aluminum alloy column 20 comprises the following components in parts by mass: 0.4 parts silicon, 0.1 parts copper, 4.8 to 5.5 parts magnesium, 0.2 parts zinc, 0.5 parts manganese, 0.3 parts chromium, 0.4 parts iron, and 0.05 parts titanium; the balance being Al, and impurities are controlled to be below 0.5 parts. It is understood that by controlling the mass part of magnesium in the five-element aluminum alloy column 20 to 4.8 to 5.5 parts, the strength and corrosion resistance of the five-element aluminum alloy column 20 can be improved; by controlling the mass part of silicon in the five-element aluminum alloy column 20 to 0.4 parts, the casting performance of the five-element aluminum alloy column 20 can be improved; and by controlling the mass part of chromium in the five-element aluminum alloy column 20 to 0.3 parts and the mass part of manganese in the five-element aluminum alloy column 20 to 0.5 parts, the oxidation resistance and mechanical strength of the five-element aluminum alloy column 20 can be enhanced.

[0050] In this embodiment, the five-element aluminum alloy column 20 comprises the following components in parts by weight: 0.4 parts silicon, 0.1 parts copper, 5.5 parts magnesium, 0.2 parts zinc, 0.5 parts manganese, 0.3 parts chromium, 0.4 parts iron, and 0.05 parts titanium; the balance is Al, and impurities are controlled to be below 0.5 parts. Its tensile strength, as measured experimentally, is 225 MPa to 300 MPa, and its elongation is greater than 15%. In other embodiments, the five-element aluminum alloy column 20 may be a 5A05 aluminum alloy column.

[0051] In this embodiment, the S-shaped workpiece is a carabiner component, which makes the S-shaped workpiece usually formed from special five-series aluminum alloy, thereby giving the S-shaped workpiece strong corrosion resistance and cold resistance, making it suitable for humid and cold environments.

[0052] Typically, since the five-series aluminum alloy column 20 is mainly heated by the inner peripheral wall of the accommodating cavity 210 of the heating slurry 200, the five-series aluminum alloy column 20 is prone to uneven heating. That is, the hardness at both ends of the five-series aluminum alloy column 20 is greater than the hardness of its periphery. When the extrusion pressure is applied to the end of the five-series aluminum alloy column 20 by the moving die head 100, the part of the five-series aluminum alloy column 20 at the end will require greater extrusion pressure to pass through the S-shaped extrusion inlet 110, the S-shaped expansion cavity 120 and the extrusion outlet 130 in sequence for forming. Thus, the hook groove structure 101 of the S-shaped workpiece 10 is still subjected to excessive force.

[0053] Please see Figure 6 In order to further reduce the extrusion pressure on the end of the five-series aluminum alloy column 20, in some embodiments, the reverse aluminum extrusion die further includes a pre-ejection structure 300, which is formed on the inner wall of the receiving cavity 210 and is positioned opposite to the S-shaped extrusion inlet 110. In the reverse aluminum extrusion operation, the following steps are included before the S-forming operation: The five-element aluminum alloy column 20 is partially pre-extruded through the pre-ejection structure 300 so that the end of the five-element aluminum alloy column 20 is formed in the S-shaped extrusion inlet 110.

[0054] It is understandable that, since the pre-ejection structure 300 on the inner wall of the accommodating cavity 210 corresponds to the position of the S-shaped extrusion inlet 110, when the transferring die head 100 applies extrusion force to the first end of the five-series aluminum alloy column 20, the second end of the five-series aluminum alloy column 20 can first contact the pre-ejection structure 300. The pre-ejection structure 300 will first extrude and form a local part of the second end of the five-series aluminum alloy column 20. The second end of the five-series aluminum alloy column 20 will quickly form a concave shape, and the extrusion force will be transmitted to the S-shaped extrusion inlet 110. The first end of the five-series aluminum alloy column 20 will quickly bulge into the S-shaped extrusion inlet 110. During this process, the contact surface of the pre-ejection structure 300 is smaller, thereby reducing the extrusion force required for the five-series aluminum alloy column 20.

[0055] Typically, since the accommodating cavity 210 of the heating slurry 200 mainly contacts the periphery of the five-series aluminum alloy column 20, the five-series aluminum alloy column 20 will be heated unevenly from the outside to the inside. That is, the hardness of the five-series aluminum alloy column 20 located at the center is greater than that of the five-series aluminum alloy column 20 located at the periphery, resulting in an uneven distribution of softness and hardness of the five-series aluminum alloy column 20 as a whole, which ultimately leads to a decrease in the overall consistency of the formed S-shaped workpiece 10.

[0056] Please refer to 7. To improve the overall consistency of the formed S-shaped workpiece 10, in some embodiments, a buffer cavity 301 is formed between the pre-ejection structure 300 and the inner wall of the accommodating cavity 210. The pre-ejection structure 300 includes a central abutment portion 310 and an outer peripheral guide portion 320. The central abutment portion 310 is located in the middle of the outer peripheral guide portion 320 and corresponds to the position of the S-shaped extrusion inlet 110. The inner wall of the accommodating cavity 210 has an arc-shaped return groove 201 formed in the circumferential direction of the outer peripheral guide portion 320. The central abutment portion 310 is used to abut against the second end of the five-series aluminum alloy column 20, and the outer peripheral guide portion 320 is used to guide the five-series aluminum alloy column 20. The second end portion of the column 20 is dispersed into the arc-shaped reflux groove 201; the outer peripheral guide portion 320 is provided with an inlet 3210, and the arc-shaped reflux groove 201 is connected to the buffer cavity 301 through the inlet 3210. The arc-shaped reflux groove 201 is used to guide the second end portion of the five-series aluminum alloy column 20 into the buffer cavity 301 through the inlet 3210; the central abutment portion 310 is provided with a plurality of outlet holes 3110, and the buffer cavity 301 is connected to the receiving cavity 210 through the plurality of outlet holes. The plurality of outlet holes 3110 are used to disperse and outlet the second end portion of the five-series aluminum alloy column 20 into the receiving cavity 210.

[0057] It is understandable that, since the central abutment 310 abuts against the second end of the five-element aluminum alloy column 20, the central abutment 310 can quickly transmit axial extrusion force to the second end of the five-element aluminum alloy column 20, causing the first end of the five-element aluminum alloy column 20 to quickly protrude into the S-shaped extrusion inlet 110. Then, the outer peripheral guide 320 guides a portion of the second end of the five-element aluminum alloy column 20 to disperse into the arc-shaped return groove 201. Next, the arc-shaped return groove 201 guides a portion of the second end of the five-element aluminum alloy column 20 to enter the buffer cavity 301 through the inlet 3210. Finally, the portion of the second end of the five-element aluminum alloy column 20 is dispersed and discharged into the receiving cavity 210 through several outlet holes 3110. This allows the portion of the second end of the five-element aluminum alloy column 20 to be mixed into the middle part of the five-element aluminum alloy column 20 through several outlet holes 3110, thereby making the hardness of the five-element aluminum alloy column 20 more uniform and improving the overall consistency of the formed S-shaped workpiece 10.

[0058] Please refer to 7. Further, the contact surface between the central abutment 310 and the second end of the five-element aluminum alloy column 20 is larger than the inner contour of the S-shaped extrusion inlet 110. The outer peripheral guide 320 is inclined from the central abutment 310 toward the arc-shaped return groove 201. The inner diameter of the inlet 3210 gradually decreases from the arc-shaped return groove 201 toward the buffer cavity 301. The inner diameter of the outlet hole 3110 gradually decreases from the buffer cavity 301 toward the receiving cavity 210. It is understandable that, since the contact surface between the central support portion 310 and the second end of the five-series aluminum alloy column 20 is larger than the inner contour of the S-shaped extrusion inlet 110, sufficient axial extrusion force can be provided to the second end of the five-series aluminum alloy column 20 through the contact surface. Since the outer peripheral guide portion 320 is inclined from the central support portion 310 to the arc-shaped return groove 201, the portion of the second end of the five-series aluminum alloy column 20 can be dispersed into the arc-shaped return groove 201 through the arc-shaped return groove 201. Since the inner diameter of the inlet 3210 gradually decreases from the arc-shaped return groove 201 to the buffer cavity 301, the portion of the second end of the five-series aluminum alloy column 20 can be quickly introduced into the buffer cavity 301 through the inlet 3210. The inner diameter of the outlet 3110 gradually decreases from the buffer cavity 301 to the receiving cavity 210, the portion of the second end of the five-series aluminum alloy column 20 can be quickly exported to the receiving cavity 210 through the outlet 3110 and mixed with the middle portion of the five-series aluminum alloy column 20.

[0059] Please see Figures 2 to 9 This disclosure also provides an S-shaped workpiece 10, which is prepared using the high-strength workpiece forming method based on a reverse aluminum extrusion die according to any of the above embodiments. It can be understood that by applying the high-strength workpiece forming method based on a reverse aluminum extrusion die of this disclosure to the manufacture of the S-shaped workpiece 10, since the S-shaped expansion cavity 120 with a larger inner contour has an clearance area in the projection direction of the hook groove forming protrusion 1110, the S-shaped pre-workpiece 30, which smoothly enters the S-shaped expansion cavity 120, can avoid the cavity wall of the S-shaped expansion cavity 120 through the clearance area, thereby reducing the interference encountered when the hook groove structure 101 moves. This allows the S-shaped pre-workpiece 30 to be pushed out more smoothly from the extrusion port 130, reducing the occurrence of deformation or breakage of the hook groove structure 101.

[0060] Compared with the prior art, this disclosure has at least the following advantages: The above-described high-strength workpiece forming method based on reverse aluminum extrusion die achieves a significantly reduced hardness by heating and softening the five-series aluminum alloy column 20 through the heating chamber 200. Then, the five-series soft column is subjected to reverse aluminum extrusion through the moving die 100, further reducing the extrusion pressure. Thus, the S-shaped pre-workpiece 30 formed by the S-shaped extrusion inlet 110 forms a hook-groove structure 101 under the action of the hook-groove forming protrusion 1110. Furthermore, because the larger inner contour of the S-shaped expansion cavity 120 has an clearance zone in the projection direction of the hook-groove forming protrusion 1110, the S-shaped pre-workpiece 30 smoothly enters the S-shaped expansion cavity 120 and avoids the cavity wall of the S-shaped expansion cavity 120 through the clearance zone, thereby reducing interference during the movement of the hook-groove structure 101. This allows the S-shaped pre-workpiece 30 to be ejected more smoothly from the extrusion outlet 130, reducing the likelihood of deformation or breakage of the hook-groove structure 101.

[0061] The embodiments described above are merely illustrative of several implementations of this disclosure, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this disclosure, and these all fall within the protection scope of this disclosure. Therefore, the protection scope of this patent should be determined by the appended claims.

Claims

1. A high-strength workpiece forming method based on a reverse aluminum extrusion die, characterized by, The high-strength workpiece forming method based on the reverse aluminum extrusion die comprises the following steps: The heating cartridge is used to perform a softening operation on the five-system aluminum alloy column to obtain a five-system soft column; The reverse aluminum extrusion operation is performed on the five-system soft column by the transition die to make the five-system soft column pass through the S-shaped extrusion inlet, the S-shaped expansion cavity and the extrusion outlet in sequence to obtain the S-shaped workpiece. The S-shaped expansion cavity gradually expands from the S-shaped extrusion inlet to the extrusion outlet. The S-shaped expansion cavity comprises a linear guide cavity and two arc-shaped pressure relief cavities which are connected in sequence, the linear guide cavity is located between the two arc-shaped pressure relief cavities, the inner contour of each arc-shaped pressure relief cavity has a first difference with the corresponding part of the inner contour of the S-shaped extrusion inlet, and the inner contour of the linear guide cavity has a second difference with the corresponding part of the inner contour of the S-shaped extrusion inlet. The stress release operation comprises the following steps:

2. The high-strength workpiece forming method based on a reverse aluminum extrusion die according to claim 1, characterized by, The linear guide cavity is used to perform a side guide forming operation on the middle part of the S-shaped pre-workpiece to reduce the stress on the cavity wall of the linear guide cavity; The arc-shaped pressure relief cavity is used to perform a pressure relief setting operation on the two end parts of the S-shaped pre-workpiece to increase the thickness of the two ends of the S-shaped pre-workpiece. The S-shaped expansion cavity comprises a linear guide cavity and two arc-shaped pressure relief cavities which are connected in sequence, the linear guide cavity is located between the two arc-shaped pressure relief cavities, the inner contour of each arc-shaped pressure relief cavity has a first difference with the corresponding part of the inner contour of the S-shaped extrusion inlet, and the inner contour of the linear guide cavity has a second difference with the corresponding part of the inner contour of the S-shaped extrusion inlet. The stress release operation comprises the following steps: The linear guide cavity is used to perform a side guide forming operation on the middle part of the S-shaped pre-workpiece to reduce the stress on the cavity wall of the linear guide cavity; 3. The high-strength workpiece forming method based on a reverse aluminum extrusion die according to claim 2, characterized by, The arc-shaped pressure relief cavity is used to perform a pressure relief setting operation on the two end parts of the S-shaped pre-workpiece to increase the thickness of the two ends of the S-shaped pre-workpiece.

4. The high-strength workpiece forming method based on a reverse aluminum extrusion die according to claim 3, characterized by, The S-shaped expansion cavity comprises a linear guide cavity and two arc-shaped pressure relief cavities which are connected in sequence, the linear guide cavity is located between the two arc-shaped pressure relief cavities, the inner contour of each arc-shaped pressure relief cavity has a first difference with the corresponding part of the inner contour of the S-shaped extrusion inlet, and the inner contour of the linear guide cavity has a second difference with the corresponding part of the inner contour of the S-shaped extrusion inlet. The stress release operation comprises the following steps: The linear guide cavity is used to perform a side guide forming operation on the middle part of the S-shaped pre-workpiece to reduce the stress on the cavity wall of the linear guide cavity; 5. The high-strength workpiece forming method based on a reverse aluminum extrusion die according to claim 4, characterized by, The arc-shaped pressure relief cavity is used to perform a pressure relief setting operation on the two end parts of the S-shaped pre-workpiece to increase the thickness of the two ends of the S-shaped pre-workpiece.

6. The high-strength workpiece forming method based on a reverse aluminum extrusion die according to claim 5, characterized by, The S-shaped expansion cavity comprises a linear guide cavity and two arc-shaped pressure relief cavities which are connected in sequence, the linear guide cavity is located between the two arc-shaped pressure relief cavities, the inner contour of each arc-shaped pressure relief cavity has a first difference with the corresponding part of the inner contour of the S-shaped extrusion inlet, and the inner contour of the linear guide cavity has a second difference with the corresponding part of the inner contour of the S-shaped extrusion inlet. The stress release operation comprises the following steps: The linear guide cavity is used to perform a side guide forming operation on the middle part of the S-shaped pre-workpiece to reduce the stress on the cavity wall of the linear guide cavity; The arc-shaped pressure relief cavity is used to perform a pressure relief setting operation on the two end parts of the S-shaped pre-workpiece to increase the thickness of the two ends of the S-shaped pre-workpiece. The S-shaped expansion cavity comprises a linear guide cavity and two arc-shaped pressure relief cavities which are connected in sequence, the linear guide cavity is located between the two arc-shaped pressure relief cavities, the inner contour of each arc-shaped pressure relief cavity has a first difference with the corresponding part of the inner contour of the S-shaped extrusion inlet, and the inner contour of the linear guide cavity has a second difference with the corresponding part of the inner contour of the S-shaped extrusion inlet. The stress release operation comprises the following steps: The linear guide cavity is used to perform a side guide forming operation on the middle part of the S-shaped pre-workpiece to reduce the stress on the cavity wall of the linear guide cavity; The arc-shaped pressure relief cavity is used to perform a pressure relief setting operation on the two end parts of the S-shaped pre-workpiece to increase the thickness of the two ends of the S-shaped pre-workpiece.

7. The high-strength workpiece forming method based on a reverse aluminum extrusion die according to claim 6, characterized by, The arc-shaped pressure relief cavity comprises in sequence an inner guiding cavity, a curved-arc thickening cavity and a clearance guiding cavity, the inner guiding cavity is close to and communicates with the end of the linear guiding cavity, the clearance guiding cavity corresponds to the position of the hook groove forming protrusion, and the first gap gradually increases from the inner guiding cavity and the clearance guiding cavity to the curved-arc thickening cavity.

8. The high-strength workpiece forming method based on a reverse aluminum extrusion die according to claim 7, characterized by, The step of the pressure relief and shaping operation specifically comprises the following steps: The inner guiding cavity and the clearance guiding cavity are used to perform an inner guiding pressure relief operation on the corresponding end of the S-shaped pre-workpiece, so that the thickness of the S-shaped pre-workpiece corresponding to the position of the curved-arc thickening cavity is increased.

9. The high-strength workpiece forming method based on a reverse aluminum extrusion die according to claim 1, characterized by, The five-system aluminum alloy column comprises the following components in mass fraction: Silicon 0.4 parts; Copper 0.1 parts; Magnesium 4.8-5.5 parts; Zinc 0.2 parts; Manganese 0.5 parts; Chromium 0.3 parts; Iron 0.4 parts; Titanium 0.05 parts; The balance is Al, and the impurities are controlled to be less than 0.5 parts.

10. A S-shaped workpiece, characterized by, The S-shaped workpiece is prepared by using the high-strength workpiece forming method based on the reverse aluminum extrusion die according to any one of claims 1-9.

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